Spark-plug.



37. EUGGESS.

SPARK PLUG. APPLICATION men APR. 19, ma.

UNITED STATES PATENT OFFICE.

DAVID L. BOGGESS, OF LIBERTY, MISSOURI.

SPARK-PLUG.

Application :tiled April 19, 1916.

To all yir/tom t may concern.' l

'lie it lt'nown that I` llvvm L. Boneless, a

eitizeu ot the United States. residing at Liberty, in the county of Clayand State of Missouri, have invented eertain new and usefulImproveuufnts in Spark-Plugs, of whieh the tollowiui,r is aspeeilieatiou. reiereure beine' had to the accompanying drawings.

This inveutitm relates to spark plugs sueh as are used on internalcombustion engines, and the general olljeet ot the invention is theprovision ol av spar'lt' plug whieh is so ronstrueted that theinsulating eore may he readily removed t'rom the bushing` withouttheueeessitvv ol applyiin;- a wreurh thereto, my invention providin"yl'or readily. duielily and easily diseonneetint' the insulatin;` eoreand its ,base from the bushing in less than one-third of the timerei'piired with ordinary spark plugs where a wreneh has to be used.

A Jfurther objeet ot' the invention is the provision ot' a. spark plugwherein the base Supporting' the eore 'is eonneetedto the bushing.hyjba-iyonetjoints, and the provision in eonueotion with the base ol alateh holding the hase from accidental disengagen'ient 'trom-'thebushing'.

`@therobjeets will appear in the course of the following' deseription.

My invention is illustrated in the aecompanying` drawings, wherein:

Figure l is a, view of a sparli' plugr eonstrueted in aeeordanee .withmy invention, the bushingand base being' in section;

Figi". 2 is an elevation ofthe spark plug shown in Figli. l:

Fig'. El is an elevation ot' the upper portion ol the bushing;

Fig. l is a top plan view of the base 1l; and Fig. 5 is a top plan viewof the bushing.

Referring to these figures, it will be seen that, as usual, theinsulating core, designated l() and which may he made of porcelain orother suitable material of like in- Sulating properties,y is disposedwithin and rigidly connected to a eollar or base, designated ll, whichis flanged as at 12. The bushing 13 is provided with the usual manysidedhead 14 whereby a wrench may be applied to it and the bushing is screwthreaded, as at l5, for engagement with the Wall of the cylinder. areeonneeted to this bushing. Disposed Specification of Letters Patent.

Any `suitable electrodes 16- Patented Feb. 13,

serial No. $2.253.

within the core l() is the usual eleetrode 17 which passes through theupper end ot the eore and hasl eonneeted thereto the binding nurl le'whereby the eleetrode li' may he corr neeted to a souree ot' elwtrieity.

ln spark plugs as ordinarily eonstrueted, the base l1 is threaded withinthe bushing lil and in order to remove thel spark plug' r wrench must beapplied to the base and the hase rotated. This olten dillieult lneeausethe base has beeoine set within the hashing, and 'turtherinore. it takesmore or time to remove and replace the sparlv' plug. lu. order toobviale these ini-onvenienees, i torni the upstandingl' wall lil of thebushing` with a plurality ot uniformly spared bayonet slots 2l). theentranee ends ol these slots exten/l `iupY downward and at anineliuation to the axis ol the lmshing and then extending al. rightangles to the axis. I have illustrated three ol these bayonet slots'disposed equr distantl'v, but a greater number may he used it desired,or a less number. The base il is provided with a plurality of outwardlypro jeeting` pins 2i spared elpiidistautly so that they may be insertedin the entrance ends ot the bayonet slots and then the base rotated soas to carry these pins into the closed ends ot the bayonet slots inwhich position the -base is lot-lied Jfrom upward movement.

In order to hold the base in engagement with the bushing and preventaccidental rotation ot' the base whieh would tend to carry the pins 21out of the slots 20g] pret erably 'torni the upstanding wall il) ot thebushing with a plurality ot' vertical slots "'7 there beingr one ofthese. lvertical slots disposed iu connection with eaeh bayonet slot.The l'lange l2 of the base is also notehed or grooved at one point, asat 23, and mounted upon the upper face of the flange a spring 24having,r an angular end whieh extends downward tln'ough the slot Q3 andprojects down below the unlos` he littingA of 'the core and base out ofen1 gage/infant with the bushine.

lt is to be Yunderstood that the bases are to be made in standard sizesto hold any standard porcelain core, and that the bushings are also tobe made in standard sizes. The slots 22 are equidistantly spaced so thatthe pins on the base l1 will Ht in any 'et the slots and thus eliminatethe necessity of carefully adjust-ing the base l1. .By usingthis'bayonet joint connection no threads :ire needed in the plug' or thebase. The base is to be formed with the pins 21 by casting the pinsthereon'and the slots are preferably formed when the bushing' is east.lilith small ears, the bushing and base would only he formed 'withrelatively small slots; and pins and the larger the engine the largerwill be the pins and the slots. The spring may be riveted or otherwiseconnected to the base, as may be found moet desirable,

l'laving described the invention, what I claim is:

l. ln a spark plug, a bushing having an upstanding wall formed withbayonet und with vertical slots between the bayonet slots, a Coresupporting base having pins engageable in said sietes and a springdetent engagenble in any one et the vertical slots to prevent thereverse rotationof the base with relation to the bushinv.

2. ln a spark plee' a bushing having' an '2:19 upstanding wall toi-inedwith bayonet slots? the entrance ends of the slots being; inelined tothe axis oi" the bushingj said tween the bayonet slots being formed-`with vertical slots, a core supporting base having a flange, theperiphery of the flange being notched at one point, and a springattached to the tace ot the flange and having un angular terminal endprojecting down through said noteh and adapted to be engagged in any oneot the vertical notches in the wall ot' the bushing, the springbeingprovided with means whereby it .may b lifted.

ln testimony whereoiC I hereunto aiix my signature in the presence oftwo witnesses.

DAVID L. BOGGESS.

Witnesses:

TRIGG L. NUTTER, EDGAR N. Doen.

